If you are growing in limited space, be proactive and plan the setup. If supplementing CO2, you can go a bit higher than that. The suggested PAR levels for optimal plant growth is 200-400 PPFD for seedlings/clones/mother plants, 400-600 PPFD for plants in the vegetative stage, and 600-900 PPFD for plants in the flowering stage. The suggested lux levels for optimal yield are between 30,000 to 70,000 lux/m2 when the plant is in the vegetative stage and between 50,000 to 90,000 lux/m2 when the plant is in the flowering stage. It is always a good idea to be extra cautious and buy a LUX or PAR meter as it can accurately determine how much light your cannabis plant is getting. Different grow lights require different distances from the top of your plants and knowing those distances will lead to optimum yield. Know your grow lights! It is vital to do a bit of research on the kind of grow lights that you have in your setup. If you have moved your plant recently, ensure that the amount of light it is getting now is in close proximity with the conditions in its previous environment - or else it may show signs of light stress.
The grow light should be raised so it is further away from your plants. If it is too hot, this most likely means that your plant is getting too much light. Do this basic hand test keep your hand under the light at canopy level to see if it is causing any irritation or discomfort on your skin. Light burn is usually caused by the grow light being too close to the plant.
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